<!DOCTYPE html>
<html lang="en">

<head>
	<meta charset="UTF-8">
	<title>碰撞粒子</title>
	<link rel="stylesheet" href="./style.css">
</head>

<body>
	<div id="box">
		<div id="ball"></div>
	</div>

	<script src="./index.js"></script>
</body>

</html>